Besides, as a key technology of 6G network, the integrated sensing and communication (ISAC) technology will enhance the communication performance through sensing information [1]}, [2]}. Due to the higher frequency bands, wider bandwidth and denser distribution of antenna arrays used in 6G, the integration of wireless signal sensing and communication will be possible in a single system. In an IoV system, the V2X communication can assist a vehicle in retrieving more traffic information outside of its sensing range, so as to make better driving decisions and save energy consumption with suitable speed adjustment and route planning. For example, in a vehicle platooning system, the multihop V2V communication can enable the last vehicle to sense the driving behaviors of the front vehicle, so as to adjust its driving speed and direction. On the contrary, the sensing information from surrounding environment can facilitate higher-accuracy location, imaging and environment reconstruction, which will improve the V2X communication efficiency with faster interruption recovery and available channel state information (CSI). Therefore, ISAC is a promising technology to enhance the energy-efficiency in future IoV systems.
